Editing Interstate 91 (section)

=== Massachusetts ===
I-91 extends {{convert|55|mi|km}} through the [[Pioneer Valley]] of western Massachusetts paralleling the [[Connecticut River]].<ref name="mass">{{cite book |last1 = Olia |first1 = Maria |title = Insiders' Guide to Massachusetts |date = 2013 |publisher = Rowman & Littlefield |isbn = 978-1-4930-0163-7 |url = https://books.google.com/books?id=7doPAQAAQBAJ&pg=PA1 |access-date = August 10, 2018 |via = Google Bools |language = en |archive-date = January 14, 2023 |archive-url = https://web.archive.org/web/20230114200614/https://books.google.com/books?id=7doPAQAAQBAJ&pg=PA1 |url-status = live }}</ref> I-91 serves as the major transportation corridor through three Massachusetts counties, linking the cities of [[Springfield, Massachusetts|Springfield]], [[Northampton, Massachusetts|Northampton]], and [[Greenfield, Massachusetts|Greenfield]].<ref name="mass" /> These three cities serve as the [[control cities]] listed on guide and mileage signs, along with [[Brattleboro, Vermont]], beginning with the first northbound conventional mileage sign ({{convert|63|mi|km|disp=sqbr}}) in Longmeadow.<ref name="MA Route Log" />

In Springfield, I-91 has an interchange with [[Interstate 291 (Massachusetts)|I-291]] at exit&nbsp;6 (old exit&nbsp;8), a {{convert|5.44|mi|km|adj=mid|-long}} [[Spur route|spur]] going eastbound to connect with the [[Massachusetts Turnpike]], for travelers going either east toward [[Boston]] or west toward [[Albany, New York]].<ref>{{cite web |title = I-91 Springfield viaduct project ahead of schedule |url = https://www.recorder.com/Interstate-91-project-ahead-of-schedule-14574291 |access-date = August 10, 2018 |work = Greenfield Recorder |date = January 2, 2018 |archive-date = August 11, 2018 |archive-url = https://web.archive.org/web/20180811031816/https://www.recorder.com/Interstate-91-project-ahead-of-schedule-14574291 |url-status = live }}</ref><ref>{{cite web |last1 = Fay |first1 = Tony |title = Cone Zone Alert: Interstate 91 Exit 8 |url = https://www.wwlp.com/news/cone-zone-alert-interstate-91-exit-8/1043515699 |location = Springfield, Massachusetts |publisher = [[WWLP-TV]] |access-date = August 15, 2018 |date = April 8, 2016 |archive-date = October 1, 2020 |archive-url = https://web.archive.org/web/20201001053147/https://www.wwlp.com/news/cone-zone-alert-interstate-91-exit-8/1043515699/ |url-status = live }}</ref> North of Springfield, I-91 briefly enters [[Chicopee, Massachusetts|Chicopee]], there is an interchange with its spur, [[Interstate 391|I-391]], at exit&nbsp;9 (old exit&nbsp;12) before turning westward to cross the Connecticut River into [[West Springfield, Massachusetts|West Springfield]]. I-391 provides direct access to [[Holyoke, Massachusetts|Holyoke]], while I-91 continues on the western side of the river.<ref name="ex" />

Just after the river crossing, exit&nbsp;11 (old exit&nbsp;14) is a major interchange with the [[Massachusetts Turnpike]] (I-90). Then, I-91 enters the city of Holyoke where exit&nbsp;12 (old exit&nbsp;15) is located. Just after an interchange with [[U.S. Route 202|US&nbsp;202]], (exit&nbsp;16) I-91 goes from three lanes to two lanes in each direction to the Vermont state line.<ref name="ex" /> After a short exit-less stretch, I-91 enters [[Northampton, Massachusetts|Northampton]], passing the [[Northampton Airport]] and an [[oxbow lake]]. The towns of [[Hadley, Massachusetts|Hadley]] and [[Amherst, Massachusetts|Amherst]], home to the main campus of the [[University of Massachusetts Amherst]], are accessible from I-91 exits in Northampton via [[Massachusetts Route 9|Route&nbsp;9]].<ref name="ex" />

Continuing north, I-91 enters [[Hatfield, Massachusetts|Hatfield]], where it begins a straight section—nearly {{convert|6|mi|km|spell=in}} without a bend in the road. Several exits provide access to US&nbsp;5 and [[Massachusetts Route 10|Route&nbsp;10]] in [[Hatfield, Massachusetts|Hatfield]] and [[Whately, Massachusetts|Whately]] before entering [[Deerfield, Massachusetts|Deerfield]].<ref>{{google maps |title = I-91 to 40 Old State Rd |url = https://www.google.com/maps/dir/42.3492899,-72.641452/42.4640879,-72.616053/@42.466033,-72.5654649,11.75z/data=!4m2!4m1!3e3 |access-date = August 10, 2018 |link = no }}</ref> I-91 has two exits in [[Greenfield, Massachusetts|Greenfield]]. At exit&nbsp;43 (old exit&nbsp;26), the southern end of its overlap with [[Massachusetts Route 2|Route&nbsp;2]], there is a rest area and visitor information center for [[Franklin County, Massachusetts|Franklin County]].<ref>{{cite web |title = Service Plaza Locations |url = https://www.mass.gov/info-details/service-plaza-locations |website = Mass.gov |access-date = August 10, 2018 |language = en |archive-date = August 9, 2018 |archive-url = https://web.archive.org/web/20180809163301/https://www.mass.gov/info-details/service-plaza-locations |url-status = live }}</ref> At exit&nbsp;46 (old exit&nbsp;27), also in Greenfield, is the northern end of its overlap with Route&nbsp;2 where access to that road is provided via a [[directional T interchange]] and exit and entry ramps on the left side of southbound I-91. Exit&nbsp;50 (old exit&nbsp;28) in [[Bernardston, Massachusetts|Bernardston]] is the last exit in Massachusetts. Beyond exit&nbsp;50, I-91 continues for about {{convert|5|mi|km|spell=in}} more before crossing into Vermont.<ref name="MA Route Log" />

Massachusetts is the only state traversed by I-91 where another numbered highway is [[Concurrency (road)|concurrent]] with the Interstate (in this case, US&nbsp;5, for a {{convert|0.5|mi|km|adj=on}} spur near the Springfield–Longmeadow town line and Route&nbsp;2, for approximately {{convert|3|mi|km|spell=in}} in Greenfield).<ref>{{cite web |url = http://ctps.org/pub/Express_Highway_Count_Locations/25_I_91.pdf |title = Concurrent Roads |publisher = ctps.org |access-date = December 29, 2017 |archive-date = December 29, 2019 |archive-url = https://web.archive.org/web/20191229065242/https://www.ctps.org/pub/Express_Highway_Count_Locations/25_I_91.pdf |url-status = live }}</ref>